bubbles which form a chemical and/or mechanical bond with the impurities and composed a froth which floats on the top. Method reduces the impurities in water

to under 15 ppm. Specifically, the electrodes consist of vertical plates of alternate polarity which are designed as push-in modules, resting on guide rails. Side doors give access to them. Labyrinth-types of baffle plates prevent the entry of unprocessed water or of impurities into the clear water duct.